Filling device of permeation tube in process of measuring methane yield of ruminant by sulfur hexafluoride tracer method

Abstract

The utility model relates to the technical field of experimental instruments, and particularly discloses a filling device for a permeation tube in the process of measuring methane yield of ruminants by a sulfur hexafluoride tracer method, which comprises a box body, round holes are formed in the surface of the box body, an opening is formed in the top surface of the box body, a stainless steel plate is welded at the bottom end of the box body, and a plurality of through holes are formed in the stainless steel plate. The box body is in an L shape, the height of the opening is 85 mm, the width of the opening is equal to that of the box body, the opening is 45 mm higher than the top of the round hole, a layer of stainless steel plate is welded to the bottom of the box body to form a crack, and the thickness of the crack is 5 mm. Further, heat of the experiment table top can be effectively isolated from being conducted to liquid nitrogen, the loss speed of the liquid nitrogen is reduced, the experiment table top is protected against low-temperature damage, the safety of the experiment environment is improved, the service life of the table top is prolonged, meanwhile, it is guaranteed that the permeation pipe is stably inserted, and toppling or slipping is avoided; the method is suitable for liquid nitrogen low-temperature operation environments.

Description

Technical Field

[0001] This utility model belongs to the field of laboratory equipment technology, specifically relating to a filling device for a permeation tube in the process of determining methane production in ruminants using the sulfur hexafluoride tracer method. Background Technology

[0002] Methane (CH4) emissions from ruminants are a major source of greenhouse gases. Although their total emissions are lower than those of carbon dioxide (CO2), the greenhouse effect of CH4 is 20 to 30 times that of CO2. This makes livestock farming, especially ruminant farming, a significant contributor to global climate change. Therefore, accurately measuring CH4 emissions from ruminants is of great scientific importance for greenhouse gas emission assessment, emission reduction strategy development, and research on CH4 formation mechanisms.

[0003] Currently, methods for determining CH4 emissions in ruminants mainly include closed-chamber measurement, tracer methods, and model prediction methods. Among these, the sulfur hexafluoride (SF6) tracer method is widely used in CH4 emission research due to its ease of operation and applicability to practical production environments. SF6 is a stable gas with similar physical properties to CH4. In the tracer method, an SF6-filled permeation tube is fed into the rumen of the experimental ruminants before the experiment. SF6 is released at a stable rate through a specific permeation tube, mixing into the animal's exhaled gas. By simultaneously detecting the concentrations of emitted CH4 and SF6 and calculating their ratio, the animal's CH4 emissions can be accurately estimated.

[0004] The advantage of the SF6 tracer method lies in its ability to be performed under natural feeding conditions, without affecting the normal activity of animals, and to provide accurate and continuous data. However, to ensure the measurement accuracy of the tracer method, the permeation tubes used in the experiment need to be pre-cooled at low temperatures and precisely filled with gas to stabilize the release rate. Existing devices, however, have many shortcomings in terms of permeation tube pre-cooling and liquid nitrogen storage and retrieval operations. For example, most existing liquid nitrogen storage devices use foam boxes or simple containers, which, although providing some insulation, are structurally fragile and easily damaged. Furthermore, the rapid evaporation of liquid nitrogen makes filling permeation tubes difficult and unsuitable for long-term experimental needs.

[0005] Furthermore, some devices require immersion in an environment containing large amounts of liquid nitrogen. Operating and filling in this exposed liquid nitrogen environment poses a risk of frostbite to operators due to the extremely low temperature, increasing experimental risks. Meanwhile, existing equipment lacks a systematic design, failing to effectively secure the permeation tube, or has large openings in the pre-cooling section, making it prone to tipping over during operation, thus affecting the pre-cooling effect and safety of the experiment.

[0006] Therefore, developing a liquid nitrogen storage and retrieval experimental device with a reasonable structure, convenient operation, and high safety, which can meet the requirements of precise precooling and stable placement of the permeation tube in the SF6 tracer method, while also possessing durability and thermal insulation performance, to overcome the shortcomings of existing technologies, is an important research topic in the current field. Utility Model Content

[0007] The purpose of this invention is to provide a filling device for the permeation tube in the process of determining methane production in ruminants using the sulfur hexafluoride tracer method, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A filling device for a permeation tube in the determination of methane production in ruminants using a sulfur hexafluoride tracer method includes a box body with circular holes on its surface and an opening on its top surface. A stainless steel plate is welded to the bottom of the box body. The box body is L-shaped. There are four circular holes arranged in a straight line. The diameter of each hole is 13 mm. One of the four holes is used to fill the permeation tube, and the other three holes are used for pre-cooling the permeation tube.

[0010] The opening is 85mm high and the width is equal to that of the box. The opening is 45mm higher than the top of the round hole and is used for storing and retrieving liquid nitrogen and for covering the opening with a foam cover to slow down the evaporation of liquid nitrogen.

[0011] The bottom of the box is formed by welding a layer of stainless steel plate to create a gap with a thickness of 5mm, which is used to isolate the heat from the desktop from being transferred to liquid nitrogen.

[0012] A foam cover is attached to the inside of the opening.

[0013] Preferably, the size of the circular hole is designed to ensure that the permeation tube is inserted firmly without tipping over, while reducing the loss of liquid nitrogen.

[0014] Preferably, the opening is 50mm higher than the top of the box and the width is equal to that of the box. The opening is used for the storage and retrieval of liquid nitrogen and can be covered with a foam cover to effectively delay the evaporation of liquid nitrogen.

[0015] Preferably, the bottom of the box body adopts a double-layer structure, which includes a bottom layer and a stainless steel plate welded to the bottom layer, with a 5mm gap between the two layers. The gap serves to insulate against low temperatures and can effectively slow down the heat conduction from the experimental table surface to the liquid nitrogen.

[0016] Preferably, the box body is made of 304 stainless steel, which has excellent low-temperature resistance, corrosion resistance and high strength, and can be used for a long time in extreme low-temperature environments without being easily deformed or damaged.

[0017] Preferably, the external dimensions of the box are 200mm in length, 100mm in width, and 80mm in height.

[0018] Preferably, the stainless steel plate is made of low-temperature resistant foam material.

[0019] Preferably, the various components of the device are connected by welding or integral molding design, and the structure has high sealing performance and stability. In the low temperature environment of liquid nitrogen, it can ensure the strength and durability of the overall structure of the device and avoid loosening or damage of the device components due to thermal expansion and contraction.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This invention, through its integrated design and the stainless steel plate partition at the bottom, effectively slows down heat conduction from the experimental platform to the liquid nitrogen, thereby reducing liquid nitrogen loss and protecting the experimental platform from low-temperature damage. This improves pre-cooling efficiency and the safety of the experimental environment. The rationally designed aperture and arrangement of the circular holes ensure stable insertion of the permeation tube, preventing tipping or slippage, thus enhancing operational safety and convenience. Furthermore, the entire device is made of stainless steel, which has excellent low-temperature resistance and corrosion resistance, making it suitable for liquid nitrogen cryogenic operating environments. In summary, this invention offers excellent pre-cooling efficiency, low-temperature resistance, and corrosion resistance, making it suitable for liquid nitrogen cryogenic operating environments. Attached Figure Description

[0022] Figure 1 This is a vertical exploded view of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram showing the dimensions of this utility model.

[0024] In the picture: 11. Box body; 12. Round hole; 13. Opening; 14. Stainless steel plate; 15. Foam cover. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1:

[0027] Please see Figure 1 - Figure 2 As shown, a filling device for a permeation tube in the process of determining methane production in ruminants by sulfur hexafluoride tracer method includes a box body 11, a round hole 12, an opening 13 and a stainless steel plate 14. The box body 11 is made of stainless steel and has a rectangular structure with dimensions of 200mm × 100mm × 35mm (length × width × height).

[0028] The top of container 11 is open, facilitating rapid access to and evaporation of liquid nitrogen, improving operational convenience, and enhancing the safety of the experimental environment. The main structure of container 11 is robust and durable, with excellent thermal insulation and corrosion resistance, making it suitable for cryogenic liquid nitrogen operations.

[0029] like Figure 1 As shown, four circular holes 12 are provided on the top plane of the main body of the box 11. The holes 12 are arranged in a straight line and are evenly distributed. The diameter of each hole 12 is 13mm. One hole 12 is used for filling the permeation tube, and the other three holes 12 are used for the low-temperature pre-cooling operation of the permeation tube. By rationally designing the diameter and arrangement of the holes 12, the stable insertion of the permeation tube can be ensured, avoiding tipping or slipping, thus improving the overall cooling effect, operational safety, and convenience of the experiment.

[0030] like Figure 1 As shown, opening 13 is located on one side of the main body of the box. The opening is rectangular, with a height of 50mm, which is 5mm higher than the top of the circular hole 12. The width of the opening is the same as the width of the main body of the box 11. The design of opening 13 facilitates the rapid storage and retrieval of liquid nitrogen. After the experiment is completed, a foam cover can be placed over the opening to slow down the evaporation of liquid nitrogen, thereby improving the cooling efficiency and utilization efficiency of liquid nitrogen and reducing the cost of experimental consumables.

[0031] like Figure 1 As shown, a stainless steel plate 14 is installed at the bottom of the main body of the box 11, forming a 5mm isolation gap between the stainless steel plate 14 and the box 11. This gap can effectively isolate the heat of the experimental platform from the liquid nitrogen, thereby improving the liquid nitrogen cooling efficiency, reducing liquid nitrogen loss, and protecting the experimental platform from low-temperature damage, thus improving the safety of the experimental environment and the service life of the platform.

[0032] When using this apparatus, the permeation tube is inserted into the main body of the box through the top circular hole 12. The permeation tube is stably fixed within the circular hole 12. The circular hole 12 for filling the permeation tube is used to fill it with sulfur hexafluoride (SF6) or other gases required for the experiment, while the other three circular holes 12 are used for pre-cooling the permeation tube. After the experiment, the liquid nitrogen evaporates through the top opening 13 and the side openings, facilitating rapid cleaning and preventing residual liquid nitrogen from affecting the experimental environment.

[0033] Furthermore, the material of the housing 11 can be selected from 304 or 316 stainless steel, aluminum alloy, or other metal materials with good low-temperature resistance and corrosion resistance to meet the durability and safety requirements of specific experimental environments. The device is not limited to measuring methane production in ruminants; it can be used to measure greenhouse gases produced by the respiration of all ruminants. Those skilled in the art can adjust the materials and uses of the device according to specific application scenarios.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A filling device for a permeable tube for use in a method for determining methane production in ruminants using sulfur hexafluoride tracer, characterized in that Including the box (11), the surface of the box (11) is provided with a round hole (12), the top surface of the box (11) is provided with an opening (13), the bottom end of the box (11) is welded with a stainless steel plate (14), the box (11) is in the shape of "L", the number of the round hole (12) is four, four round holes (12) are arranged in a straight line, the hole diameter of the round hole (12) is 13mm, one of the four groups of round holes (12) is used for canning the permeation tube, and the remaining three round holes (12) are used for precooling the permeation tube; The height of the opening (13) is 85mm, the width is equal to the box, the opening (13) is higher than the top of the round hole (12) by 45mm, is used for accessing liquid nitrogen and covering a foam cover at the opening to delay the evaporation of liquid nitrogen; The bottom of the box (11) is formed by welding a layer of stainless steel plate (14) to form a gap, the thickness of the gap is 5mm, which is used for isolating the heat of liquid nitrogen from being transmitted to the desktop; The inside of the opening (13) is covered with a foam cover (15).

2. A filling device for a permeable tube for use in a method of determining methane production in a ruminant animal using sulphur hexafluoride tracer according to claim 1, characterised in that: The material of the box (11) is 304 stainless steel.

3. A filling device for a permeable tube for use in a method of determining methane production in a ruminant animal using SF6 tracer according to claim 1, characterised in that: The outer dimensions of the box (11) are 200mm long, 100mm wide and 80mm high.

4. A filling device for a permeable tube for use in a method of determining methane production in a ruminant animal using sulfur hexafluoride tracer according to claim 1, characterized in that: The stainless steel plate (14) is made of low-temperature resistant foam material.

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